The content originally appeared on: CNN Hong Kong (CNN)China's northern port city of Tianjin and central province of Henan have further tightened Covid restrictions as the highly contagious Omicron variant continues to spread, posing the gravest challenge yet to the country's zero-Covid strategy. Tianjin, which detected China's first community spread of Omicron on Saturday, is rolling out a second round of mass testing on its 14 million residents on Wednesday. As of noon Tuesday, 97 people had tested positive. The […]
